Can someone explain to me why someone is asking if this crew took off with one engine inop? I mean, come on. Let's give the professional pilots a benefit of the doubt as there is so little concrete information to hand. Look what has to happen: Tower operator at the departing field watching the take off, in the position of saying: "hey, PIA XXX, one of your props isn't turning!" That kind of speculation is bizarre.
Perhaps some losses in translation are occurring, per RAT 5's point, or some people are speaking with incomplete information. It happens.